Tibiarotasjon ved gange og jogg på tredemølle, en metodestudie

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Abstract

Introduction
Excessive pronation of the foot is thought to cause overuse injuries in the lower extremities. Pronation with calcaneal evertion leads to a significant internal rotation of the tibia. The purpose of this study was to investigate whether a portable kinematic sensor could be used to measure tibiarotation.
Method
Four healthy subjects walked and ran on the treadmill with and without shoes at speeds 2.5, 4.0, 6,0 and 9.0 km/h. A MTx kinematic sensor was used to measure accelerations and orientation along three orthogonal axes. The sensor of 10 grams was attached with a neoprenorthoses on the right tibia, 2/3 distance between the medial malleol and tuberositas tibiae.
Results
The reliability was assessed by ICC statistics. ICC(1.5) showed good data quality (ICC> 0.9) in 6 of 8 data series, and ICC(1.1) showed acceptable data quality (ICC> 0.7) at 5 of 8 data series.
Discussion
I have not found other studies that have measured tibiarotation with kinematic sensor and therefore had to develop a method to identify the initial heel strike and maximum tibiarotation. The tibiarotation in this study were slightly higher than in other studies. Error sources in this study was variable skin movements and noise on the yaw curves in the reading of maximal tibiarotation. Further research should reduce skinmovements and take more steps in to the analysis.
Conclusion
The results indicate that the use of body fixed kinematic sensors is a reliabel method to measure tibia internal rotation. The method should be developed further to provide better measurements.